2-231077092-C-T

Position:

• chr2-231077092-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_002807.4(PSMD1):​c.1001C>T​(p.Ala334Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: PSMD1 NM_002807.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.61

Genes affected

PSMD1 (HGNC:9554): (proteasome 26S subunit, non-ATPase 1) The 26S proteasome is a multicatalytic proteinase complex with a highly ordered structure composed of 2 complexes, a 20S core and a 19S regulator. The 20S core is composed of 4 rings of 28 non-identical subunits; 2 rings are composed of 7 alpha subunits and 2 rings are composed of 7 beta subunits. The 19S regulator is composed of a base, which contains 6 ATPase subunits and 2 non-ATPase subunits, and a lid, which contains up to 10 non-ATPase subunits. Proteasomes are distributed throughout eukaryotic cells at a high concentration and cleave peptides in an ATP/ubiquitin-dependent process in a non-lysosomal pathway. An essential function of a modified proteasome, the immunoproteasome, is the processing of class I MHC peptides. This gene encodes the largest non-ATPase subunit of the 19S regulator lid, which is responsible for substrate recognition and binding. There is evidence that this proteasome and its subunits interact with viral proteins, including those of coronaviruses. Alternatively spliced transcript variants have been found for this gene.[provided by RefSeq, Aug 2020]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.31704324).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PSMD1	NM_002807.4	c.1001C>T	p.Ala334Val	missense_variant	9/25	ENST00000308696.11
PSMD1	NM_001191037.2	c.1001C>T	p.Ala334Val	missense_variant	9/24
PSMD1	XM_017004517.3	c.1001C>T	p.Ala334Val	missense_variant	9/18
PSMD1	NR_034059.2	n.990C>T		non_coding_transcript_exon_variant	8/24

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PSMD1	ENST00000308696.11	c.1001C>T	p.Ala334Val	missense_variant	9/25	1	NM_002807.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 09, 2024

The c.1001C>T (p.A334V) alteration is located in exon 9 (coding exon 9) of the PSMD1 gene. This alteration results from a C to T substitution at nucleotide position 1001, causing the alanine (A) at amino acid position 334 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.31
BayesDel_addAF	Uncertain	0.071	D
BayesDel_noAF	Benign	-0.14
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.13	.;T;.;.
Eigen	Benign	0.11
Eigen_PC	Uncertain	0.30
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D;D;.;D
M_CAP	Benign	0.0047	T
MetaRNN	Benign	0.32	T;T;T;T
MetaSVM	Benign	-0.87	T
MutationAssessor	Benign	1.0	L;L;L;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Pathogenic	0.89	D
PROVEAN	Benign	-1.5	N;N;N;.
REVEL	Benign	0.14
Sift	Benign	0.057	T;T;T;.
Sift4G	Uncertain	0.023	D;D;D;D
Polyphen		0.060	B;B;B;.
Vest4		0.59
MutPred		0.46		Gain of stability (P = 0.0795);Gain of stability (P = 0.0795);Gain of stability (P = 0.0795);Gain of stability (P = 0.0795);
MVP		0.47
MPC		0.74
ClinPred		0.92	D
GERP RS		5.2
Varity_R		0.32
gMVP		0.62

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs375669050; hg19: chr2-231941806;